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Finding the Fourth Proportional to 839.13, 1,258.69 and 456.81

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Solution

The fourth proportional to 839.13, 1,258.69 and 456.81 is: 685.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.13 : 1,258.69 = 456.81 : x
  2. Step 2: Convert to fraction form
    839.13/1,258.69 = 456.81/x
  3. Step 3: Cross multiply
    839.13x = 1,258.69 × 456.81
  4. Step 4: Simplify right side
    839.13x = 574,982.18
  5. Step 5: Solve for x
    x = 574,982.18/839.13
  6. Step 6: Final answer
    x = 685.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.